Definition: A bitter balsamic resin obtained from tropical American
trees of the genus Elaphrium (E. tomentosum and E. Tacamahaca), and
also from East Indian trees of the genus Calophyllum; also, the
resinous exhudation of the balsam poplar.
Definition: Any tree yielding tacamahac resin, especially, in North
America, the balsam poplar, or balm of Gilead (Populus balsamifera).